Martel Electronics MasterCAL - Manual (Page 38)

MasterCAL
Users Manual
28
Using Measure Mode
Note
To achieve best noise rejection and highest
accuracy performance, do not use the
battery eliminator, and tie all three common
jacks together.
The operating mode (i.e., MEASURE, SOURCE) is
shown in a reverse-video bar on the display. If the
calibrator is not in MEASURE mode, press
M until
MEASURE is shown. You must be in MEASURE
mode to change any of the MEASURE parameters.
Measurement Ranges
The calibrator normally changes to the appropriate
measurement range automatically. The lower right
side of the display shows either “Range” or “Auto
Range” depending on the range status. Auto Range
switch points are shown in the specifications at the
end of this manual. When you press the Range
softkey, the range is locked. Press it again to cycle
to and lock on the next higher range. Auto Range is
reactivated when you select another measurement
function.
If the range is locked, overrange inputs produce a
display of
- - - - - - . In Auto Range, out of range inputs
produce a display of ! ! ! ! ! ! .
Measuring Electrical Parameters
When you turn on the calibrator, it powers up in the
dc voltage measurement function. Figure 10 shows
electrical measurement connections. To select an
electrical measurement function from either
SOURCE or MEASURE/SOURCE mode, first press
M for MEASURE mode, then proceed as follows:
1. Press m for current, v for dc voltage, h
once for ac voltage or twice for frequency, or
q for resistance.